Stormy Daniels, an adult film star, filed a civil lawsuit against Donald Trump Tuesday in Los Angeles Superior Court, contending that the non-disclosure agreement she signed just days before the 2016 election to keep quiet about an alleged sexual relationship with Trump was invalid because he never signed it.

Daniels, whose real name is Stephanie Clifford, and Trump's personal attorney, Michael Cohen, signed the agreement on Oct. 28, 2016, 11 days before the election.

In the lawsuit, filed by Los Angeles attorney Michael Avenatti, Daniels argues that because the agreement is invalid, she's under no obligation to remain silent.